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构造变形的机制不同对煤岩结构演化具有重要的控制作用,而结构演化的不同会导致煤层气(瓦斯)赋存状态的变化.本文通过对两淮煤田构造煤样品进行的X射线衍射分析,并结合激光Raman光谱和傅立叶红外光谱的讨论,深入研究了不同变质程度和变形机制构造煤的大分子结构以及官能团的演化响应及其机理.结果表明,由于变质程度和变形机制的不同,构造煤大分子结构参数的演化趋势与原生结构煤参数有着明显的差别;不同变形机制对各类官能团的脱落和大分子结构的缩聚有着不同的影响,构造变形作用可以导致煤岩次生结构缺陷的产生并降低构造煤大分子结构稳定性;由于不同变形机制引起的次生结构缺陷变化不同,导致构造煤的大分子结构单元在堆砌方向和延展方向上出现了耦合互补式的演化过程;由构造变形作用导致的化学结构的变化以及次生结构缺陷的产生是造成构造煤与原生结构煤大分子结构变化不同的主要原因.
Different deformation tectonic mechanisms play an important controlling role in the evolution of coal and rock structure, and the different structural evolution will lead to the change of occurrence of coalbed methane (gas) .Based on the X-ray diffraction analysis of tectonic coal samples from the Huaibei coalfield, Based on the discussion of laser Raman spectroscopy and Fourier transform infrared spectroscopy, the macromolecular structures of coal with different metamorphic degree and deformation mechanism as well as the evolutionary response and mechanism of functional groups were studied. The results show that due to the different degree of metamorphism and deformation mechanism, The evolution trend of macromolecule structural parameters is obviously different from that of primary structural coal. Different deformation mechanisms have different effects on the exfoliation of various functional groups and the polycondensation of macromolecule structure. The tectonic deformation can cause the secondary structure defects of coal and rock And the structural stability of structural macromolecular coal is reduced. Due to the different secondary structure defects caused by different deformation mechanisms, the macromolecular structural units of tectonic coal have a coupled and complementary evolution process in the stacking direction and the extension direction. The chemical structure caused by changes in the role and secondary structural defects Raw coal is caused by a different configuration of the original raw coal macromolecular structure mainly structural changes.